Submission #468957

#	Time	Username	Problem	Language	Result	Execution time	Memory
468957		Autumn	Chase (CEOI17_chase)	C++17	0 / 100	51 ms	7192 KiB

chase

#include <bits/stdc++.h>
using namespace std;

#define int int64_t

vector<vector<int>> graph;
vector<int> pigeons;

int dfs(int v, int p, int bread){
    int x=0;
    for(int u:graph[v]){
        x+=pigeons[u];
    }
    if(p==-1) x+=pigeons[v];
    pigeons[v]=x;
    
    if(bread<=1)return x;
    
    int oha=0;
    for(auto u:graph[v]){
        if(p==u)continue;
        oha = max(dfs(u,v,bread-1),oha);
    }
    //cout<<v<<": "<<x+oha<<endl;
    return oha;
}

void pv(vector<int>&v){
    for(auto u:v){
        cout<<u<<" ";
    }
    cout<<endl;
}

signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);

    int n,v;
    cin>>n>>v;
    graph.resize(n);
    pigeons.resize(n);
    for(int i=0;i<n;i++){
        cin>>pigeons[i];
    }
    for(int i=0;i<n-1;i++){
        int a,b;
        cin>>a>>b;
        a--;
        b--;
        graph[a].push_back(b);
        graph[b].push_back(a);
    }
    //pv(pigeons);
    int sol= -pigeons[0] +dfs(0,-1,v);
    //pv(pigeons);
    cout<<sol<<"\n";
    

}

• Subtask 1: 0 / 20
• Subtask 2: 0 / 20
• Subtask 3: 0 / 30
• Subtask 4: 0 / 30